d. because it is the correct answer
I think it is B sorry if it is wrong
I think it is D. take 15 credits each term
Answer: (1) visible light, with wavelengths between 0.4 and 0.8 micrometre, (2) ultraviolet light, with wavelengths shorter than 0.4 micrometre, and (3) infrared radiation, with wavelengths longer than 0.8 micrometre.
Explanation: <em>hope that helps :p</em>